I have an issue with mapping

[ArmRob1]

At first, I downloaded everything via NuGet ScClient.Unity with all his dependences.
After I create class MyListener

class MyListner

and implemented the interfaced IBasicListener
And as you can see there is no issue but when I enter Unity I got this

Unity console

After double-clicking on the error it opens Visual Studio and

class MyListner

it no more recognizes the downloaded NuGet

Thanks, Robert.